Robertshaw RS9110 Installation Manual page 11

Alternate Wiring (Conventional Systems)
If labels do not match letters on the thermostat, check the chart below and connect to terminal as shown
here (See notes, below).
If wires will be connected to both RC and RH/R terminals, remove metal jumper.
If C or X wire is available then you can connect with C terminal. If there is no C or X
wire then no need to connect with C terminal.
If you have a heat pump without auxiliary/backup heat connect O or B, not both. If you do
not have a heat pump, do not connect B. Wrap bare end of wire with electrical tape.
Place a jumper (piece of wire) between Y and W if you are using a heat pump without
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auxiliary/backup heat.
WIRING
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